294-295 / 1676
The effect of the mean parotid dose on RTOG xerostomia grade 2 or
more (1 year) depends on RT technique (unilateral versus bilateral RT)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0
10
20
30
40
50
60
70
NTCP (%)
Mean dose parotid glands
Unilateral irradiation
Bilateral irradiation
EXAMPLE: predictive factor
Source: Prospective Data Registration program UMCG